Question 1135396
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See the  TWIN  problem *) and its numerous solutions at these links


https://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.72342.html

https://www.algebra.com/algebra/homework/Linear-equations/Linear-equations.faq.question.93951.html

https://www.algebra.com/algebra/homework/word/mixtures/Mixture_Word_Problems.faq.question.671080.html

https://www.algebra.com/algebra/homework/proportions/Proportions.faq.question.1132246.html (*)

http://mathforum.org/library/drmath/sets/select/dm_1000_lockers.html


I especially recommend you to look into MY SOLUTION at the link marked (*) in the list


<A HREF=https://www.algebra.com/algebra/homework/proportions/Proportions.faq.question.1132246.html>https://www.algebra.com/algebra/homework/proportions/Proportions.faq.question.1132246.html</A>


https://www.algebra.com/algebra/homework/proportions/Proportions.faq.question.1132246.html



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*) &nbsp;&nbsp;Strictly saying, &nbsp;the problem I am referring to, &nbsp;is not a &nbsp;TWIN &nbsp;problem - it is a &nbsp;PARENT &nbsp;problem to yours . . .